Less than a quarter of the moon's surface is visible during the 'crescent' phases ...
within about 7.4 days before or after each New Moon.
No a new moon is not VISIBLE
A full moon.
When less and less of the moon is visible, it is transitioning from a full moon to a new moon. This phase is known as the waning gibbous phase, followed by the third quarter, waning crescent, and finally the new moon.
when the moon is considered new, the sunlit side of the moon is not visable to the earth
the part of the moon cycle when you would not see it is called the new moon.
The moon phase you are describing is the waxing crescent phase. During this phase, less than half of the moon is illuminated, and the visible portion is increasing as it progresses toward the first quarter phase. The illumination grows as the moon orbits the Earth, moving away from the new moon phase.
These are different phases of the moon based on its appearance as observed from Earth. Crescent moon is when less than half of the moon is visible, first quarter is when half of the moon is visible, waning gibbous is when more than half but less than full moon is visible, and waxing gibbous is the phase when more than half but less than full moon is visible.
first quarter moon http://www.wolframalpha.com/input/?i=moon+8pm+december+5+2008
Only within the moon's umbra.
It sounds like the moon is currently waxing gibbous, with more than a quarter but less than half of the moon visible. As it progresses towards the third quarter phase, the visible portion will continue to decrease until only half of the moon is visible.
The moon phase between waxing crescent and first quarter is called waxing gibbous. In this phase, the moon is more than half illuminated but less than full.
After the full moon phase, the moon's illumination begins to decrease as it moves towards the new moon phase. This is known as the waning phase, where less and less of the moon's illuminated surface is visible from Earth.